The trial of Seth Mazzaglia entered its fifteenth day Tuesday, with the focus shifting away from key witness Kathryn McDonough and turning to other testimonies.

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After 10 days on the stand, McDonough's testimony came to an end somewhat abruptly Monday afternoon.

McDonough faced a final grilling about crucial points that the jury heard many times over -- that McDonough told Mazzaglia's defense team that Lizzi Marriott had a seizure and died while having rough sex, but she later told a grand jury that Mazzaglia had strangled Marriott to death and then raped her.

Without a break, an expert on domestic abuse took the stand.

Dr. Scott Hampton spoke in general terms about the techniques abusers use to control their partners and explained why a victim might comply with unusual demands.

Hampton said victims in such cases will often tell inconsistent stories about what they're going through, but once they're separated from an abuser and feel safe, they may then tell the truth.